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I need help identifying these sauropod teeth from Yixian Formation
-Andy- posted a topic in Fossil ID
Hi all, I have several sauropod teeth from the Yixian Formation of Liaoning that I need help identifying. This is Tooth 1 - White Length: 44 mm Formation: Jianshangou Beds of Yixian Formation Locality: Chaomidianzi, Sihetun, Beipiao, Liaoning Province I believe this is a Dongbeititan dongi tooth as this tooth has the morphology of titanosauriform teeth, and Dongbeititan is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Chaomidianzi (my source was confident of that locality) --- This is Tooth 2 - Red Formation: Lujiatun Bed of Yixian Formation Locality: Yanzigou, Shangyuan, Beipiao, Liaoning I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Yanzigou and the red matrix. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical My ID is based off this paper "Basal titanosauriform (Dinosauria, Sauropoda) teeth from the Lower Cretaceous Yixian Formation of Liaoning Province, China" --- This is Tooth 3 - Partial Formation: Lujiatun Bed of Yixian Formation Locality: Yanzigou, Shangyuan, Beipiao, Liaoning I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation and locality is based off the red matrix in the cross section. This tooth was resold from my source but he confirms it's definitely within Beipiao and either from Yanzigou or Sihetun. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical --- This is Tooth 4 - Tiny Formation: Yixian Formation Locality: Sihetun, Beipiao, Liaoning This is the toughest tooth of all due to its size and incompleteness. It's the top half of a spoon-shaped crown. Again, the source admits being a reseller but he promises the locality is accurate. I believe this is a Titanosauriform indet. I showed this tooth to @hxmendoza and he agrees it's a tooth, not a claw. The closest match I can find to this tooth is MSNM V6214 from "Sauropod teeth from the Middle Jurassic of Madagascar, and the oldest record of Titanosauriformes" May I have your thoughts on these IDs please? Thank you.
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A friend of mine have this dragonfly coming from Beipiao, Liaoxi, China, he bought it as Aeschnidium sp. It would be possible to figure out the species, even tentatively? Thanks!
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The order of Acipenseriformes (Sturgeon-like fishes) both includes sturgeons (Acipenseridae) and paddlefish (Polyodontidae). At least three Sturgeon-like fishes (Acipenseriformes) can be found in the Jiufotang Formation (Jehol Group) and in the Yixian Formation in western Liaoning and northern Hebei Province China: Peipiaosteus pani Liu and Zhou, 1965, Protopsephurus liui Lu, 1994 and Yanosteus longidorsalis Jin, Tian, Yang & Deng, 1995. The Jiufotang Formation - where this Peipiaosteus comes from - is dated to about 120.3+/-0.7 million years ago, which was during the Aptian age of the Cretaceous; the Yixian Formation - where P. liui and Y. longidorsalis can be found - is dated slightly older, around 125-121 million years ago (Barremian-early Aptian). Peipiaosteus pani, Liu and Zhou 1965, a relative of nowadays sturgeons, is from the Jiufotang Formation, Pani Lake, Liaoning. This sturgeon is characterized by a long fusiform trunk and a short dorsal fin. The origin of the dorsal fin is a little before that of the anal fin. The normal size of these specimens normally is around 15 to 30 cm – but I’ve seen a couple of fish exceeding 60cm. Line drawing from Grande et al. 2002, p. 218: References: Liu, H. & Zhou J. (1965): A new Sturgeon from the Upper Jurassic of Liaoning, North China. Vertebrata PalAsiatica Vol. 9, No. 3, 1965, p. 237 ff. Zhou, Z.(1992) Review on Peipiaosteus based on new materials of P. pani. Vertebrata PalAsiatica Vol 30, No. 2, pp 85-101. Grande, L., Jin, F., Yabumoto, Y. & Bemis, W. E. (2002) Protopsephurus liui, a well-preserved primitive paddlefish (Acipenseriformes: Polyodontidae) from the Lower Cretaceous of China, Journal of Vertebrate Paleontology, 22:2, 209-237, DOI: 10.1671/0272-4634(2002)022[0209:PLAWPP]2.0.CO;2.
